Seminole 5HPS series of low temperature batch circulating environmentally friendly grain dryers with a capacity of over 30 tons. By means of optimizing structure, rational selection of materials, advanced manufacturing technology and modular production, the drying uniformity of grain driers is improved and energy consumption is reduced. The key indexes of drying non-uniformity, breakage rate and waist burst are all in the leading level in the same industry. The core components of the product, such as on-line moisture detector, control system and circular slow-thawing cylinder, are the company's own technology, filling the domestic gap, changing the current situation that all the core components of the industry depend on imports, and laying the foundation for the full localization of grain dryers in China.